﻿/*******************************************************************************************
 * Copyright (c) 2006-2009 Alex Robson, Rob Simmons, Craig Israel, and Rachel Twyford
 *
 * Use of this software in any form requires that you have both 
 * read and agreed to the following terms:
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions: 
 *
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the 
 * documentation and/or other materials provided with the distribution.
 * Neither the name of Nvigorate nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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using System;
using System.Collections.Generic;
using Nvigorate.Common.Reflection;
using Nvigorate.Relational.Mapping.Interface;

namespace Nvigorate.Relational.Record
{
    internal class FindAssignmentEvaluator<T> where T : IRecord
    {
        private Dictionary<IAssignmentPoint, object> _fieldValues = new Dictionary<IAssignmentPoint, object>();

        public Dictionary<IAssignmentPoint, object> FieldValues
        {
            get { return _fieldValues; }
            set { _fieldValues = value; }
        }

        public bool RecordHasValues(T record)
        {
            foreach (IAssignmentPoint point in _fieldValues.Keys)
            {
                object value = (typeof(T).Equals(typeof(IRecord))) ?
                                                                       ((IRecord) record)[point]
                                   : Reflector.Read(record, point.Field);
                if(!value.Equals(_fieldValues[point]))
                {
                    return false;
                }
            }
            return true;
        }

        internal FindAssignmentEvaluator()
        {
            
        }

        internal FindAssignmentEvaluator(Dictionary<IAssignmentPoint, object> fieldValues)
        {
            _fieldValues = fieldValues;
        }
    }

    internal class FindEvaluator<T> : IDisposable
    {
        private Dictionary<string, object> _fieldValues = new Dictionary<string, object>();

        public Dictionary<string, object> FieldValues
        {
            get { return _fieldValues; }
            set { _fieldValues = value; }
        }

        public bool RecordHasValues(T record)
        {
            foreach (string field in _fieldValues.Keys)
            {
                object value = (typeof(T).Equals(typeof(IRecord))) ?
                                                                       ((IRecord)record)[field]
                                   : Reflector.Read(record, field);
                if (!value.Equals(_fieldValues[field]))
                {
                    return false;
                }
            }
            return true;
        }

        internal FindEvaluator()
        {

        }

        internal FindEvaluator(Dictionary<string, object> fieldValues)
        {
            _fieldValues = fieldValues;
        }

        #region Implementation of IDisposable

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        /// <filterpriority>2</filterpriority>
        public void Dispose()
        {
            if(_fieldValues != null)
            {
                _fieldValues.Clear();
                _fieldValues = null;
            }
        }

        #endregion
    }
}